anonymous
  • anonymous
Hey,i want to make a circuit for alarm that rings out(for a duration) when AC 220v mains is comes to ON after a failure/pause.Suggest some...
MIT 6.002 Circuits and Electronics, Spring 2007
katieb
  • katieb
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anonymous
  • anonymous
Connect a small plug-in power supply to your 220-volt line. Use DC output of power supply to drive a 555 timer circuit that can turn on an alarm for a preset period.

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